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Thanks Eric, Martin, Tim, Ron, Chris and Herb.
Another unusual tidbit about pronghorns:
When westerners built fences in the prairies, it created extreme problems for the pronghorns, because they can't jump UP. They are plains animals and can jump across ditches and very low stuff, but not up and over fences. After hundreds got tangled by barbed wire fences- and died- a fairly recent solution was devised: leave a gap between the top wire and the wire below it that was big enough for the pronghorns to squeeze through.
This solution works, and it's a lot easier than teaching the animals how to high jump.
Added note: members of the deer family live mostly in forested areas, where jumping over fallen trees was necessary for the species to survive. They CAN jump over most fences. (well, I'm not sure about caribou ).